A.-2ac | B.2ab2 | C.ab | D.-2abc |
1 |
2 |
A.2x+4x=8x2 | B.3x+2y=5xy |
C.7x2-3x2=4 | D.9a2b-9ba2=0 |
A.32与43 | B.3c2b与-8b2c | ||
C.
| D.4mn2与2m2n |
A.a2+a3=a5 | B.x+x=x2 | C.4x2-3x3=1 | D.-(-x+1)=x-1 |
A.2a+3b=5ab | B.3ab-5ba=-2ab |
C.-52+4a2=9a2 | D.4ab-ab=4 |
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